Bitfinex LEO Token
ERC20
This contract is an ERC20 token.
Name
Bitfinex LEO Token
Symbol
LEO
Decimals
18
Total Supply
660,000,000 LEO
About link description
UNUS SED LEO (LEO) is a cryptocurrency and operates on the Ethereum platform. UNUS SED LEO has a current supply of 985,239,504 with 953,954,130 in circulation. The last known price of UNUS SED LEO is 2.95418161 USD and is up 2.59 over the last 24 hours. It is currently trading on 17 active market(s) with $2,978,020.16 traded over the last 24 hours. More information can be found at https://www.bitfinex.com/.
Identical Contracts
The following contracts have identical source code.
Stats
Public Functions
15
Event Types
5
Code Size
29,189 bytes
Events (5) keyboard_arrow_up
Constants (1) keyboard_arrow_up
State Variables (13) keyboard_arrow_up
Functions
changeController keyboard_arrow_up
Modifiers help
onlyController checks for the following:
Source Code
function changeController(address _newController) public onlyController {
emit ControlTransferred(controller, _newController);
controller = _newController;
}
transfer keyboard_arrow_up
Requirements help
transfersEnabled must be true
Source Code
function transfer(address _to, uint256 _amount) public returns (bool success) {
require(transfersEnabled);
doTransfer(msg.sender, _to, _amount);
return true;
}
transferFrom keyboard_arrow_up
Requirements help
Source Code
function transferFrom(
address _from,
address _to,
uint256 _amount
) public returns (bool success) {
// The controller of this contract can move tokens around at will,
// this is important to recognize! Confirm that you trust the
// controller of this contract, which in most situations should be
// another open source smart contract or 0x0
if (msg.sender != controller) {
require(transfersEnabled);
// The standard ERC 20 transferFrom functionality
if (allowed[_from][msg.sender] < MAX_UINT) {
require(allowed[_from][msg.sender] >= _amount);
allowed[_from][msg.sender] -= _amount;
}
}
doTransfer(_from, _to, _amount);
return true;
}
balanceOf keyboard_arrow_up
approve keyboard_arrow_up
Requirements help
transfersEnabled must be true
One or more of the following:
Source Code
function approve(address _spender, uint256 _amount)
public
returns (bool success)
{
require(transfersEnabled);
// To change the approve amount you first have to reduce the addresses`
// allowance to zero by calling `approve(_spender,0)` if it is not
// already 0 to mitigate the race condition described here:
// https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
require((_amount == 0) || (allowed[msg.sender][_spender] == 0));
// Alerts the token controller of the approve function call
if (isContract(controller)) {
require(
TokenController(controller).onApprove(msg.sender, _spender, _amount)
);
}
allowed[msg.sender][_spender] = _amount;
emit Approval(msg.sender, _spender, _amount);
return true;
}
allowance keyboard_arrow_up
approveAndCall keyboard_arrow_up
Requirements help
null
Source Code
function approveAndCall(
address _spender,
uint256 _amount,
bytes memory _extraData
) public returns (bool success) {
require(approve(_spender, _amount));
ApproveAndCallFallBack(_spender).receiveApproval(
msg.sender,
_amount,
address(this),
_extraData
);
return true;
}
totalSupply keyboard_arrow_up
balanceOfAt keyboard_arrow_up
Source Code
function balanceOfAt(address _owner, uint256 _blockNumber)
public
view
returns (uint256)
{
// These next few lines are used when the balance of the token is
// requested before a check point was ever created for this token, it
// requires that the `parentToken.balanceOfAt` be queried at the
// genesis block for that token as this contains initial balance of
// this token
if (
(balances[_owner].length == 0) ||
(balances[_owner][0].fromBlock > _blockNumber)
) {
if (address(parentToken) != address(0)) {
return
parentToken.balanceOfAt(_owner, min(_blockNumber, parentSnapShotBlock));
} else {
// Has no parent
return 0;
}
// This will return the expected balance during normal situations
} else {
return getValueAt(balances[_owner], _blockNumber);
}
}
totalSupplyAt keyboard_arrow_up
Source Code
function totalSupplyAt(uint256 _blockNumber) public view returns (uint256) {
// These next few lines are used when the totalSupply of the token is
// requested before a check point was ever created for this token, it
// requires that the `parentToken.totalSupplyAt` be queried at the
// genesis block for this token as that contains totalSupply of this
// token at this block number.
if (
(totalSupplyHistory.length == 0) ||
(totalSupplyHistory[0].fromBlock > _blockNumber)
) {
if (address(parentToken) != address(0)) {
return parentToken.totalSupplyAt(min(_blockNumber, parentSnapShotBlock));
} else {
return 0;
}
// This will return the expected totalSupply during normal situations
} else {
return getValueAt(totalSupplyHistory, _blockNumber);
}
}
createCloneToken keyboard_arrow_up
Parameters help
Source Code
function createCloneToken(
string memory _cloneTokenName,
uint8 _cloneDecimalUnits,
string memory _cloneTokenSymbol,
uint256 _snapshotBlock,
bool _transfersEnabled
) public returns (address) {
if (_snapshotBlock == 0) _snapshotBlock = block.number;
MiniMeToken cloneToken = tokenFactory.createCloneToken(
address(this),
_snapshotBlock,
_cloneTokenName,
_cloneDecimalUnits,
_cloneTokenSymbol,
_transfersEnabled
);
cloneToken.changeController(msg.sender);
// An event to make the token easy to find on the blockchain
emit NewCloneToken(address(cloneToken), _snapshotBlock);
return address(cloneToken);
}
generateTokens keyboard_arrow_up
Modifiers help
onlyController checks for the following:
Requirements help
Source Code
function generateTokens(address _owner, uint256 _amount)
public
onlyController
returns (bool)
{
uint256 curTotalSupply = totalSupply();
require(curTotalSupply + _amount >= curTotalSupply); // Check for overflow
uint256 previousBalanceTo = balanceOf(_owner);
require(previousBalanceTo + _amount >= previousBalanceTo); // Check for overflow
updateValueAtNow(totalSupplyHistory, curTotalSupply + _amount);
updateValueAtNow(balances[_owner], previousBalanceTo + _amount);
emit Transfer(address(0), _owner, _amount);
return true;
}
destroyTokens keyboard_arrow_up
Modifiers help
onlyController checks for the following:
Requirements help
Source Code
function destroyTokens(address _owner, uint256 _amount)
public
onlyController
returns (bool)
{
uint256 curTotalSupply = totalSupply();
require(curTotalSupply >= _amount);
uint256 previousBalanceFrom = balanceOf(_owner);
require(previousBalanceFrom >= _amount);
updateValueAtNow(totalSupplyHistory, curTotalSupply - _amount);
updateValueAtNow(balances[_owner], previousBalanceFrom - _amount);
emit Transfer(_owner, address(0), _amount);
return true;
}
enableTransfers keyboard_arrow_up
Modifiers help
onlyController checks for the following:
Source Code
function enableTransfers(bool _transfersEnabled) public onlyController {
transfersEnabled = _transfersEnabled;
}
constructor keyboard_arrow_up
Internal Functions
Internal functions are parts of the contract that can't be used directly, but instead are used by the public functions listed above.
internal MiniMeToken.doTransfer keyboard_arrow_up
Requirements help
Source Code
function doTransfer(
address _from,
address _to,
uint256 _amount
) internal {
if (_amount == 0) {
emit Transfer(_from, _to, _amount); // Follow the spec to louch the event when transfer 0
return;
}
require(parentSnapShotBlock < block.number);
// Do not allow transfer to 0x0 or the token contract itself
require((_to != address(0)) && (_to != address(this)));
// If the amount being transfered is more than the balance of the
// account the transfer throws
uint256 previousBalanceFrom = balanceOfAt(_from, block.number);
require(previousBalanceFrom >= _amount);
// Alerts the token controller of the transfer
if (isContract(controller)) {
require(TokenController(controller).onTransfer(_from, _to, _amount));
}
// First update the balance array with the new value for the address
// sending the tokens
updateValueAtNow(balances[_from], previousBalanceFrom - _amount);
// Then update the balance array with the new value for the address
// receiving the tokens
uint256 previousBalanceTo = balanceOfAt(_to, block.number);
require(previousBalanceTo + _amount >= previousBalanceTo); // Check for overflow
updateValueAtNow(balances[_to], previousBalanceTo + _amount);
// An event to make the transfer easy to find on the blockchain
emit Transfer(_from, _to, _amount);
}
internal MiniMeToken.getValueAt keyboard_arrow_up
Source Code
function getValueAt(Checkpoint[] storage checkpoints, uint256 _block)
internal
view
returns (uint256)
{
if (checkpoints.length == 0) return 0;
// Shortcut for the actual value
if (_block >= checkpoints[checkpoints.length - 1].fromBlock)
return checkpoints[checkpoints.length - 1].value;
if (_block < checkpoints[0].fromBlock) return 0;
// Binary search of the value in the array
uint256 min = 0;
uint256 max = checkpoints.length - 1;
uint256 mid = 0;
while (max > min) {
mid = (max + min + 1) / 2;
if (checkpoints[mid].fromBlock <= _block) {
min = mid;
} else {
max = mid - 1;
}
}
return checkpoints[min].value;
}
internal MiniMeToken.updateValueAtNow keyboard_arrow_up
Source Code
function updateValueAtNow(Checkpoint[] storage checkpoints, uint256 _value)
internal
{
if (
(checkpoints.length == 0) ||
(checkpoints[checkpoints.length - 1].fromBlock < block.number)
) {
Checkpoint storage newCheckPoint = checkpoints[checkpoints.length++];
newCheckPoint.fromBlock = uint256(block.number);
newCheckPoint.value = uint256(_value);
} else {
Checkpoint storage oldCheckPoint = checkpoints[checkpoints.length - 1];
oldCheckPoint.value = uint256(_value);
}
}